Detail

A ComboBoxEntry is a widget that allows the user to choose from a list
of valid choices or enter a different value. It is very similar to a
ComboBox, but it displays the selected value in an entry to allow
modifying it.

Creates a new ComboBoxEntry which has a Entry as child and a list of
strings as popup. You can get the Entry from a ComboBoxEntry using
binGetChild. To add and remove strings from the list, just modify model
using its data manipulation API.